runtime/gc/space/image_space.cc - platform/art - Gitiles

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "image_space.h"

 #include "base/stl_util.h"
 #include "base/unix_file/fd_file.h"
 #include "gc/accounting/space_bitmap-inl.h"
 #include "mirror/art_method.h"
 #include "mirror/class-inl.h"
 #include "mirror/object-inl.h"
 #include "oat_file.h"
 #include "os.h"
 #include "runtime.h"
 #include "space-inl.h"
 #include "utils.h"

 namespace art {
 namespace gc {
 namespace space {

 Atomic<uint32_t> ImageSpace::bitmap_index_(0);

 ImageSpace::ImageSpace(const std::string& name, MemMap* mem_map,
                        accounting::SpaceBitmap* live_bitmap)
     : MemMapSpace(name, mem_map, mem_map->Begin(), mem_map->End(), mem_map->End(),
                   kGcRetentionPolicyNeverCollect) {
   DCHECK(live_bitmap != nullptr);
   live_bitmap_.reset(live_bitmap);
 }

 static bool GenerateImage(const std::string& image_file_name, std::string* error_msg) {
   const std::string boot_class_path_string(Runtime::Current()->GetBootClassPathString());
   std::vector<std::string> boot_class_path;
   Split(boot_class_path_string, ':', boot_class_path);
   if (boot_class_path.empty()) {
     *error_msg = "Failed to generate image because no boot class path specified";
     return false;
   }

   std::vector<std::string> arg_vector;

   std::string dex2oat(GetAndroidRoot());
   dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat");
   arg_vector.push_back(dex2oat);

   std::string image_option_string("--image=");
   image_option_string += image_file_name;
   arg_vector.push_back(image_option_string);

   arg_vector.push_back("--runtime-arg");
   arg_vector.push_back("-Xms64m");

   arg_vector.push_back("--runtime-arg");
   arg_vector.push_back("-Xmx64m");

   arg_vector.push_back("--runtime-arg");
   std::string checkstr = "-implicit-checks";
   int nchecks = 0;
   char checksep = ':';

   if (!Runtime::Current()->ExplicitNullChecks()) {
     checkstr += checksep;
     checksep = ',';
     checkstr += "null";
     ++nchecks;
   }
   if (!Runtime::Current()->ExplicitSuspendChecks()) {
     checkstr += checksep;
     checksep = ',';
     checkstr += "suspend";
     ++nchecks;
   }

   if (!Runtime::Current()->ExplicitStackOverflowChecks()) {
     checkstr += checksep;
     checksep = ',';
     checkstr += "stack";
     ++nchecks;
   }

   if (nchecks == 0) {
     checkstr += ":none";
   }

   arg_vector.push_back(checkstr);

   for (size_t i = 0; i < boot_class_path.size(); i++) {
     arg_vector.push_back(std::string("--dex-file=") + boot_class_path[i]);
   }

   std::string oat_file_option_string("--oat-file=");
   oat_file_option_string += image_file_name;
   oat_file_option_string.erase(oat_file_option_string.size() - 3);
   oat_file_option_string += "oat";
   arg_vector.push_back(oat_file_option_string);

   arg_vector.push_back(StringPrintf("--base=0x%x", ART_BASE_ADDRESS));

   if (kIsTargetBuild) {
     arg_vector.push_back("--image-classes-zip=/system/framework/framework.jar");
     arg_vector.push_back("--image-classes=preloaded-classes");
   } else {
     arg_vector.push_back("--host");
   }

   const std::vector<std::string>& compiler_options = Runtime::Current()->GetImageCompilerOptions();
   for (size_t i = 0; i < compiler_options.size(); ++i) {
     arg_vector.push_back(compiler_options[i].c_str());
   }

   std::string command_line(Join(arg_vector, ' '));
   LOG(INFO) << "GenerateImage: " << command_line;
   return Exec(arg_vector, error_msg);
 }

 ImageSpace* ImageSpace::Create(const char* original_image_file_name) {
   if (OS::FileExists(original_image_file_name)) {
     // If the /system file exists, it should be up-to-date, don't try to generate
     std::string error_msg;
     ImageSpace* space = ImageSpace::Init(original_image_file_name, false, &error_msg);
     if (space == nullptr) {
       LOG(FATAL) << "Failed to load image '" << original_image_file_name << "': " << error_msg;
     }
     return space;
   }
   // If the /system file didn't exist, we need to use one from the dalvik-cache.
   // If the cache file exists, try to open, but if it fails, regenerate.
   // If it does not exist, generate.
   std::string image_file_name(GetDalvikCacheFilenameOrDie(original_image_file_name));
   std::string error_msg;
   if (OS::FileExists(image_file_name.c_str())) {
     space::ImageSpace* image_space = ImageSpace::Init(image_file_name.c_str(), true, &error_msg);
     if (image_space != nullptr) {
       return image_space;
     } else {
       LOG(WARNING) << error_msg;
     }
   }
   CHECK(GenerateImage(image_file_name, &error_msg))
       << "Failed to generate image '" << image_file_name << "': " << error_msg;
   ImageSpace* space = ImageSpace::Init(image_file_name.c_str(), true, &error_msg);
   if (space == nullptr) {
     LOG(FATAL) << "Failed to load image '" << original_image_file_name << "': " << error_msg;
   }
   return space;
 }

 void ImageSpace::VerifyImageAllocations() {
   byte* current = Begin() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
   while (current < End()) {
     DCHECK_ALIGNED(current, kObjectAlignment);
     mirror::Object* obj = reinterpret_cast<mirror::Object*>(current);
     CHECK(live_bitmap_->Test(obj));
     CHECK(obj->GetClass() != nullptr) << "Image object at address " << obj << " has null class";
     if (kUseBakerOrBrooksReadBarrier) {
       obj->AssertReadBarrierPointer();
     }
     current += RoundUp(obj->SizeOf(), kObjectAlignment);
   }
 }

 ImageSpace* ImageSpace::Init(const char* image_file_name, bool validate_oat_file,
                              std::string* error_msg) {
   CHECK(image_file_name != nullptr);

   uint64_t start_time = 0;
   if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
     start_time = NanoTime();
     LOG(INFO) << "ImageSpace::Init entering image_file_name=" << image_file_name;
   }

   UniquePtr<File> file(OS::OpenFileForReading(image_file_name));
   if (file.get() == NULL) {
     *error_msg = StringPrintf("Failed to open '%s'", image_file_name);
     return nullptr;
   }
   ImageHeader image_header;
   bool success = file->ReadFully(&image_header, sizeof(image_header));
   if (!success || !image_header.IsValid()) {
     *error_msg = StringPrintf("Invalid image header in '%s'", image_file_name);
     return nullptr;
   }

   // Note: The image header is part of the image due to mmap page alignment required of offset.
   UniquePtr<MemMap> map(MemMap::MapFileAtAddress(image_header.GetImageBegin(),
                                                  image_header.GetImageSize(),
                                                  PROT_READ | PROT_WRITE,
                                                  MAP_PRIVATE,
                                                  file->Fd(),
                                                  0,
                                                  false,
                                                  image_file_name,
                                                  error_msg));
   if (map.get() == NULL) {
     DCHECK(!error_msg->empty());
     return nullptr;
   }
   CHECK_EQ(image_header.GetImageBegin(), map->Begin());
   DCHECK_EQ(0, memcmp(&image_header, map->Begin(), sizeof(ImageHeader)));

   UniquePtr<MemMap> image_map(MemMap::MapFileAtAddress(nullptr, image_header.GetImageBitmapSize(),
                                                        PROT_READ, MAP_PRIVATE,
                                                        file->Fd(), image_header.GetBitmapOffset(),
                                                        false,
                                                        image_file_name,
                                                        error_msg));
   if (image_map.get() == nullptr) {
     *error_msg = StringPrintf("Failed to map image bitmap: %s", error_msg->c_str());
     return nullptr;
   }
   uint32_t bitmap_index = bitmap_index_.FetchAndAdd(1);
   std::string bitmap_name(StringPrintf("imagespace %s live-bitmap %u", image_file_name,
                                        bitmap_index));
   UniquePtr<accounting::SpaceBitmap> bitmap(
       accounting::SpaceBitmap::CreateFromMemMap(bitmap_name, image_map.release(),
                                                 reinterpret_cast<byte*>(map->Begin()),
                                                 map->Size()));
   if (bitmap.get() == nullptr) {
     *error_msg = StringPrintf("Could not create bitmap '%s'", bitmap_name.c_str());
     return nullptr;
   }

   Runtime* runtime = Runtime::Current();
   mirror::Object* resolution_method = image_header.GetImageRoot(ImageHeader::kResolutionMethod);
   runtime->SetResolutionMethod(down_cast<mirror::ArtMethod*>(resolution_method));
   mirror::Object* imt_conflict_method = image_header.GetImageRoot(ImageHeader::kImtConflictMethod);
   runtime->SetImtConflictMethod(down_cast<mirror::ArtMethod*>(imt_conflict_method));
   mirror::Object* default_imt = image_header.GetImageRoot(ImageHeader::kDefaultImt);
   runtime->SetDefaultImt(down_cast<mirror::ObjectArray<mirror::ArtMethod>*>(default_imt));

   mirror::Object* callee_save_method = image_header.GetImageRoot(ImageHeader::kCalleeSaveMethod);
   runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kSaveAll);
   callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsOnlySaveMethod);
   runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsOnly);
   callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsAndArgsSaveMethod);
   runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsAndArgs);

   UniquePtr<ImageSpace> space(new ImageSpace(image_file_name, map.release(), bitmap.release()));
   if (kIsDebugBuild) {
     space->VerifyImageAllocations();
   }

   space->oat_file_.reset(space->OpenOatFile(image_file_name, error_msg));
   if (space->oat_file_.get() == nullptr) {
     DCHECK(!error_msg->empty());
     return nullptr;
   }

   if (validate_oat_file && !space->ValidateOatFile(error_msg)) {
     DCHECK(!error_msg->empty());
     return nullptr;
   }

   if (VLOG_IS_ON(heap) || VLOG_IS_ON(startup)) {
     LOG(INFO) << "ImageSpace::Init exiting (" << PrettyDuration(NanoTime() - start_time)
              << ") " << *space.get();
   }
   return space.release();
 }

 OatFile* ImageSpace::OpenOatFile(const char* image_path, std::string* error_msg) const {
   const ImageHeader& image_header = GetImageHeader();
   std::string oat_filename = ImageHeader::GetOatLocationFromImageLocation(image_path);

   OatFile* oat_file = OatFile::Open(oat_filename, oat_filename, image_header.GetOatDataBegin(),
                                     !Runtime::Current()->IsCompiler(), error_msg);
   if (oat_file == NULL) {
     *error_msg = StringPrintf("Failed to open oat file '%s' referenced from image %s: %s",
                               oat_filename.c_str(), GetName(), error_msg->c_str());
     return nullptr;
   }
   uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum();
   uint32_t image_oat_checksum = image_header.GetOatChecksum();
   if (oat_checksum != image_oat_checksum) {
     *error_msg = StringPrintf("Failed to match oat file checksum 0x%x to expected oat checksum 0x%x"
                               " in image %s", oat_checksum, image_oat_checksum, GetName());
     return nullptr;
   }
   return oat_file;
 }

 bool ImageSpace::ValidateOatFile(std::string* error_msg) const {
   CHECK(oat_file_.get() != NULL);
   for (const OatFile::OatDexFile* oat_dex_file : oat_file_->GetOatDexFiles()) {
     const std::string& dex_file_location = oat_dex_file->GetDexFileLocation();
     uint32_t dex_file_location_checksum;
     if (!DexFile::GetChecksum(dex_file_location.c_str(), &dex_file_location_checksum, error_msg)) {
       *error_msg = StringPrintf("Failed to get checksum of dex file '%s' referenced by image %s: "
                                 "%s", dex_file_location.c_str(), GetName(), error_msg->c_str());
       return false;
     }
     if (dex_file_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) {
       *error_msg = StringPrintf("ValidateOatFile found checksum mismatch between oat file '%s' and "
                                 "dex file '%s' (0x%x != 0x%x)",
                                 oat_file_->GetLocation().c_str(), dex_file_location.c_str(),
                                 oat_dex_file->GetDexFileLocationChecksum(),
                                 dex_file_location_checksum);
       return false;
     }
   }
   return true;
 }

 OatFile* ImageSpace::ReleaseOatFile() {
   CHECK(oat_file_.get() != NULL);
   return oat_file_.release();
 }

 void ImageSpace::Dump(std::ostream& os) const {
   os << GetType()
       << " begin=" << reinterpret_cast<void*>(Begin())
       << ",end=" << reinterpret_cast<void*>(End())
       << ",size=" << PrettySize(Size())
       << ",name=\"" << GetName() << "\"]";
 }

 }  // namespace space
 }  // namespace gc
 }  // namespace art
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "image_space.h"

	#include "base/stl_util.h"
	#include "base/unix_file/fd_file.h"
	#include "gc/accounting/space_bitmap-inl.h"
	#include "mirror/art_method.h"
	#include "mirror/class-inl.h"
	#include "mirror/object-inl.h"
	#include "oat_file.h"
	#include "os.h"
	#include "runtime.h"
	#include "space-inl.h"
	#include "utils.h"

	namespace art {
	namespace gc {
	namespace space {

	Atomic<uint32_t> ImageSpace::bitmap_index_(0);

	ImageSpace::ImageSpace(const std::string& name, MemMap* mem_map,
	accounting::SpaceBitmap* live_bitmap)
	: MemMapSpace(name, mem_map, mem_map->Begin(), mem_map->End(), mem_map->End(),
	kGcRetentionPolicyNeverCollect) {
	DCHECK(live_bitmap != nullptr);
	live_bitmap_.reset(live_bitmap);
	}

	static bool GenerateImage(const std::string& image_file_name, std::string* error_msg) {
	const std::string boot_class_path_string(Runtime::Current()->GetBootClassPathString());
	std::vector<std::string> boot_class_path;
	Split(boot_class_path_string, ':', boot_class_path);
	if (boot_class_path.empty()) {
	*error_msg = "Failed to generate image because no boot class path specified";
	return false;
	}

	std::vector<std::string> arg_vector;

	std::string dex2oat(GetAndroidRoot());
	dex2oat += (kIsDebugBuild ? "/bin/dex2oatd" : "/bin/dex2oat");
	arg_vector.push_back(dex2oat);

	std::string image_option_string("--image=");
	image_option_string += image_file_name;
	arg_vector.push_back(image_option_string);

	arg_vector.push_back("--runtime-arg");
	arg_vector.push_back("-Xms64m");

	arg_vector.push_back("--runtime-arg");
	arg_vector.push_back("-Xmx64m");

	arg_vector.push_back("--runtime-arg");
	std::string checkstr = "-implicit-checks";
	int nchecks = 0;
	char checksep = ':';

	if (!Runtime::Current()->ExplicitNullChecks()) {
	checkstr += checksep;
	checksep = ',';
	checkstr += "null";
	++nchecks;
	}
	if (!Runtime::Current()->ExplicitSuspendChecks()) {
	checkstr += checksep;
	checksep = ',';
	checkstr += "suspend";
	++nchecks;
	}

	if (!Runtime::Current()->ExplicitStackOverflowChecks()) {
	checkstr += checksep;
	checksep = ',';
	checkstr += "stack";
	++nchecks;
	}

	if (nchecks == 0) {
	checkstr += ":none";
	}

	arg_vector.push_back(checkstr);

	for (size_t i = 0; i < boot_class_path.size(); i++) {
	arg_vector.push_back(std::string("--dex-file=") + boot_class_path[i]);
	}

	std::string oat_file_option_string("--oat-file=");
	oat_file_option_string += image_file_name;
	oat_file_option_string.erase(oat_file_option_string.size() - 3);
	oat_file_option_string += "oat";
	arg_vector.push_back(oat_file_option_string);

	arg_vector.push_back(StringPrintf("--base=0x%x", ART_BASE_ADDRESS));

	if (kIsTargetBuild) {
	arg_vector.push_back("--image-classes-zip=/system/framework/framework.jar");
	arg_vector.push_back("--image-classes=preloaded-classes");
	} else {
	arg_vector.push_back("--host");
	}

	const std::vector<std::string>& compiler_options = Runtime::Current()->GetImageCompilerOptions();
	for (size_t i = 0; i < compiler_options.size(); ++i) {
	arg_vector.push_back(compiler_options[i].c_str());
	}

	std::string command_line(Join(arg_vector, ' '));
	LOG(INFO) << "GenerateImage: " << command_line;
	return Exec(arg_vector, error_msg);
	}

	ImageSpace* ImageSpace::Create(const char* original_image_file_name) {
	if (OS::FileExists(original_image_file_name)) {
	// If the /system file exists, it should be up-to-date, don't try to generate
	std::string error_msg;
	ImageSpace* space = ImageSpace::Init(original_image_file_name, false, &error_msg);
	if (space == nullptr) {
	LOG(FATAL) << "Failed to load image '" << original_image_file_name << "': " << error_msg;
	}
	return space;
	}
	// If the /system file didn't exist, we need to use one from the dalvik-cache.
	// If the cache file exists, try to open, but if it fails, regenerate.
	// If it does not exist, generate.
	std::string image_file_name(GetDalvikCacheFilenameOrDie(original_image_file_name));
	std::string error_msg;
	if (OS::FileExists(image_file_name.c_str())) {
	space::ImageSpace* image_space = ImageSpace::Init(image_file_name.c_str(), true, &error_msg);
	if (image_space != nullptr) {
	return image_space;
	} else {
	LOG(WARNING) << error_msg;
	}
	}
	CHECK(GenerateImage(image_file_name, &error_msg))
	<< "Failed to generate image '" << image_file_name << "': " << error_msg;
	ImageSpace* space = ImageSpace::Init(image_file_name.c_str(), true, &error_msg);
	if (space == nullptr) {
	LOG(FATAL) << "Failed to load image '" << original_image_file_name << "': " << error_msg;
	}
	return space;
	}

	void ImageSpace::VerifyImageAllocations() {
	byte* current = Begin() + RoundUp(sizeof(ImageHeader), kObjectAlignment);
	while (current < End()) {
	DCHECK_ALIGNED(current, kObjectAlignment);
	mirror::Object* obj = reinterpret_cast<mirror::Object*>(current);
	CHECK(live_bitmap_->Test(obj));
	CHECK(obj->GetClass() != nullptr) << "Image object at address " << obj << " has null class";
	if (kUseBakerOrBrooksReadBarrier) {
	obj->AssertReadBarrierPointer();
	}
	current += RoundUp(obj->SizeOf(), kObjectAlignment);
	}
	}

	ImageSpace* ImageSpace::Init(const char* image_file_name, bool validate_oat_file,
	std::string* error_msg) {
	CHECK(image_file_name != nullptr);

	uint64_t start_time = 0;
	if (VLOG_IS_ON(heap) \|\| VLOG_IS_ON(startup)) {
	start_time = NanoTime();
	LOG(INFO) << "ImageSpace::Init entering image_file_name=" << image_file_name;
	}

	UniquePtr<File> file(OS::OpenFileForReading(image_file_name));
	if (file.get() == NULL) {
	*error_msg = StringPrintf("Failed to open '%s'", image_file_name);
	return nullptr;
	}
	ImageHeader image_header;
	bool success = file->ReadFully(&image_header, sizeof(image_header));
	if (!success \|\| !image_header.IsValid()) {
	*error_msg = StringPrintf("Invalid image header in '%s'", image_file_name);
	return nullptr;
	}

	// Note: The image header is part of the image due to mmap page alignment required of offset.
	UniquePtr<MemMap> map(MemMap::MapFileAtAddress(image_header.GetImageBegin(),
	image_header.GetImageSize(),
	PROT_READ \| PROT_WRITE,
	MAP_PRIVATE,
	file->Fd(),
	0,
	false,
	image_file_name,
	error_msg));
	if (map.get() == NULL) {
	DCHECK(!error_msg->empty());
	return nullptr;
	}
	CHECK_EQ(image_header.GetImageBegin(), map->Begin());
	DCHECK_EQ(0, memcmp(&image_header, map->Begin(), sizeof(ImageHeader)));

	UniquePtr<MemMap> image_map(MemMap::MapFileAtAddress(nullptr, image_header.GetImageBitmapSize(),
	PROT_READ, MAP_PRIVATE,
	file->Fd(), image_header.GetBitmapOffset(),
	false,
	image_file_name,
	error_msg));
	if (image_map.get() == nullptr) {
	*error_msg = StringPrintf("Failed to map image bitmap: %s", error_msg->c_str());
	return nullptr;
	}
	uint32_t bitmap_index = bitmap_index_.FetchAndAdd(1);
	std::string bitmap_name(StringPrintf("imagespace %s live-bitmap %u", image_file_name,
	bitmap_index));
	UniquePtr<accounting::SpaceBitmap> bitmap(
	accounting::SpaceBitmap::CreateFromMemMap(bitmap_name, image_map.release(),
	reinterpret_cast<byte*>(map->Begin()),
	map->Size()));
	if (bitmap.get() == nullptr) {
	*error_msg = StringPrintf("Could not create bitmap '%s'", bitmap_name.c_str());
	return nullptr;
	}

	Runtime* runtime = Runtime::Current();
	mirror::Object* resolution_method = image_header.GetImageRoot(ImageHeader::kResolutionMethod);
	runtime->SetResolutionMethod(down_cast<mirror::ArtMethod*>(resolution_method));
	mirror::Object* imt_conflict_method = image_header.GetImageRoot(ImageHeader::kImtConflictMethod);
	runtime->SetImtConflictMethod(down_cast<mirror::ArtMethod*>(imt_conflict_method));
	mirror::Object* default_imt = image_header.GetImageRoot(ImageHeader::kDefaultImt);
	runtime->SetDefaultImt(down_cast<mirror::ObjectArray<mirror::ArtMethod>*>(default_imt));

	mirror::Object* callee_save_method = image_header.GetImageRoot(ImageHeader::kCalleeSaveMethod);
	runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kSaveAll);
	callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsOnlySaveMethod);
	runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsOnly);
	callee_save_method = image_header.GetImageRoot(ImageHeader::kRefsAndArgsSaveMethod);
	runtime->SetCalleeSaveMethod(down_cast<mirror::ArtMethod*>(callee_save_method), Runtime::kRefsAndArgs);

	UniquePtr<ImageSpace> space(new ImageSpace(image_file_name, map.release(), bitmap.release()));
	if (kIsDebugBuild) {
	space->VerifyImageAllocations();
	}

	space->oat_file_.reset(space->OpenOatFile(image_file_name, error_msg));
	if (space->oat_file_.get() == nullptr) {
	DCHECK(!error_msg->empty());
	return nullptr;
	}

	if (validate_oat_file && !space->ValidateOatFile(error_msg)) {
	DCHECK(!error_msg->empty());
	return nullptr;
	}

	if (VLOG_IS_ON(heap) \|\| VLOG_IS_ON(startup)) {
	LOG(INFO) << "ImageSpace::Init exiting (" << PrettyDuration(NanoTime() - start_time)
	<< ") " << *space.get();
	}
	return space.release();
	}

	OatFile* ImageSpace::OpenOatFile(const char* image_path, std::string* error_msg) const {
	const ImageHeader& image_header = GetImageHeader();
	std::string oat_filename = ImageHeader::GetOatLocationFromImageLocation(image_path);

	OatFile* oat_file = OatFile::Open(oat_filename, oat_filename, image_header.GetOatDataBegin(),
	!Runtime::Current()->IsCompiler(), error_msg);
	if (oat_file == NULL) {
	*error_msg = StringPrintf("Failed to open oat file '%s' referenced from image %s: %s",
	oat_filename.c_str(), GetName(), error_msg->c_str());
	return nullptr;
	}
	uint32_t oat_checksum = oat_file->GetOatHeader().GetChecksum();
	uint32_t image_oat_checksum = image_header.GetOatChecksum();
	if (oat_checksum != image_oat_checksum) {
	*error_msg = StringPrintf("Failed to match oat file checksum 0x%x to expected oat checksum 0x%x"
	" in image %s", oat_checksum, image_oat_checksum, GetName());
	return nullptr;
	}
	return oat_file;
	}

	bool ImageSpace::ValidateOatFile(std::string* error_msg) const {
	CHECK(oat_file_.get() != NULL);
	for (const OatFile::OatDexFile* oat_dex_file : oat_file_->GetOatDexFiles()) {
	const std::string& dex_file_location = oat_dex_file->GetDexFileLocation();
	uint32_t dex_file_location_checksum;
	if (!DexFile::GetChecksum(dex_file_location.c_str(), &dex_file_location_checksum, error_msg)) {
	*error_msg = StringPrintf("Failed to get checksum of dex file '%s' referenced by image %s: "
	"%s", dex_file_location.c_str(), GetName(), error_msg->c_str());
	return false;
	}
	if (dex_file_location_checksum != oat_dex_file->GetDexFileLocationChecksum()) {
	*error_msg = StringPrintf("ValidateOatFile found checksum mismatch between oat file '%s' and "
	"dex file '%s' (0x%x != 0x%x)",
	oat_file_->GetLocation().c_str(), dex_file_location.c_str(),
	oat_dex_file->GetDexFileLocationChecksum(),
	dex_file_location_checksum);
	return false;
	}
	}
	return true;
	}

	OatFile* ImageSpace::ReleaseOatFile() {
	CHECK(oat_file_.get() != NULL);
	return oat_file_.release();
	}

	void ImageSpace::Dump(std::ostream& os) const {
	os << GetType()
	<< " begin=" << reinterpret_cast<void*>(Begin())
	<< ",end=" << reinterpret_cast<void*>(End())
	<< ",size=" << PrettySize(Size())
	<< ",name=\"" << GetName() << "\"]";
	}

	} // namespace space
	} // namespace gc
	} // namespace art